import java.sql.SQLOutput;

public class Main {
    public static void main(String[] args) {
        String s1 = "hello";
        String s2 = "world";
        System.out.println(s1);
        System.out.println(s2);
        System.out.println(s1+s2);
        int num = 10;
        String str1 = num + "";
        String str2 = String.valueOf(num);


    }
}